These definitely don't sound like they'd make the cut due to the baggage involved.

1) Score Cards or scoring systems. They did have something like it for deep dungeons, but putting it in savage is asking for trouble. It's better just to keep victory binary.
2) Systems that track Efficiency. Basically, it falls into the same realm as the DPS meters.

Stuff they most certainly could add

1) Better systems to facilitate learning a fight. I'm talking giving people actual information on the mechanic in the game and spelling it out for them, because this is one headache that isn't going to go away. Even if it only happens upon dying to the mechanic, it would greatly reduce the requirement on seeing videos before the fight, which means less prep time and more time playing the game.

2) A better progress tracker. They got progress trackers for when you do dungeons and things so I don't know why they can't be used for savage mechanics.